Here is the full list of all 21 Giana Sisters: Dream Runners achievements worth 1,000 gamerscore.
Dash 3 owls in succession in a bot match (single player only!)
Hit an opponent with a twist-upgraded cannonball
Win on Reaving Falls against three bots or in an online match.
Win on Doomtide Forest against three bots or in an online match.
Win on Chasm of Tears against three bots or in an online match.
Win on Quaking Mire against three bots or in an online match.
Win on Soarstone Crag against three bots or in an online match.
Win on Stranglevine Ruins against three bots or in an online match.
Score a point while using boost
Win on Embersnow Mountain against three bots or in an online match.
Win on Nettle Vale against three bots or in an online match.
Jump on the heads of 3 owls in succession in a bot match (single player only!)
Dash through a breakable block
Win on Gentle Promenade against three bots or in an online match.
Twirl on top of a jump
Swap places with another player
Ghost through a projectile or hazard after using the Owlverpower
Hit all three opponents with the same powerdash
Hit an opponent with 5 supertwirl-projectiles during one supertwirl
Hit an opponent with an owl
Hit an opponent with a meteor